sharding

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The architecture of Neki planetscale.com
Neki is PlanetScale’s sharding layer for vanilla PostgreSQL that presents a single Postgres endpoint while routing queries across a fleet of Postgres instances. It does this with a set of tightly‑coupled components—Router, Sidecar, PostgresManager, Admin, Operator, and etcd‑backed Data Topology—each handling a specific piece of the scaling, failover, and query‑planning puzzle.
PlanetScaleplanetscale.comHarshit Gangal4d8 min
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Uber Redesigns M3DB Sharding with Subclusters to Limit Failure Impact infoq.com
Uber reworked M3DB's shard placement by grouping nodes into fixed-size subclusters, each owning a disjoint shard range, to bound the blast radius of node failures. A greedy shard‑move algorithm (O(S log S) + O(S×N)) handles scaling while preserving existing placement tooling.
InfoQinfoq.comLeela Kumili15h2 min

The architecture of Nekiplanetscale.com